Function expansion based topology optimization of NRD guide device using hybrid method of harmony search and gradient method

Abstract

In recent years, optimization technique has attracted a lot of attention to develop high performance electromagnetic devices and various kinds of design strategies have been reported. Among them, topology optimization method has potential to develop innovative devices. In this paper, the function expansion based topology optimization method, which has been developed for design of photonic devices, is extended to be applied to design of nonradiative dielectric waveguide (NRD guide) devices. In the optimal design of NRD guide devices, solution search sometimes tends to fall into local minimum compared with the design of photonic devices. Therefore, we develop a novel hybrid optimization method combining harmony search which is one of the evolutionary algorithm and gradient method using adjoint variable method for robust and efficient design of NRD guide devices.

Study on single‐mode transmission in non‐radiative dielectric waveguide

“…Miniaturization of circuit elements is necessary to integrate those elements on a limited footprint. In order to miniaturize millimeterwave devices, non-radiative dielectric waveguide (NRD guide) [1][2][3][4][5][6][7][8] is a promising platform because of its non-radiative nature. In recent years, various kinds of millimeter waveguides have been proposed such as the microstrip line, dielectric waveguide, and parallel plate dielectric waveguide (PPDW).…”

Finite Element Beam Propagation Method Based on Coordinate Transformation for Optimal Design of Optical Waveguide Devices

“…With the spread of new information and communication services such as IoT and 5G services, communication traffic is expected to continue to increase, and even the backbone optical communication network is desired to achieve even higher speeds and larger capacity. In order to expand communication capacity, high performance photonic and millimeterwave devices are desired and various kinds of optimal design technique have been reported [1]- [5] . In order to achieve efficient optimal design, efficient and accurate numerical simulation techniques are required and finite difference time domain (FDTD) method [6], [7] and finite element method (FEM) [8], [9] are often used and their computational efficiency and accuracy have been continuously improved.…”